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D( x )
x = 0
x+15 = 0
x = 0
x = 0
x+15 = 0
x+15 = 0
x+15 = 0 // - 15
x = -15
x in (-oo:-15) U (-15:0) U (0:+oo)
200/(x+15)+200/x = 10 // - 10
200/(x+15)+200/x-10 = 0
(200*x)/(x*(x+15))+(200*(x+15))/(x*(x+15))+(-10*x*(x+15))/(x*(x+15)) = 0
200*(x+15)-10*x*(x+15)+200*x = 0
400*x-10*x^2-150*x+3000 = 0
250*x-10*x^2+3000 = 0
250*x-10*x^2+3000 = 0
10*(25*x-x^2+300) = 0
25*x-x^2+300 = 0
DELTA = 25^2-(-1*4*300)
DELTA = 1825
DELTA > 0
x = (1825^(1/2)-25)/(-1*2) or x = (-1825^(1/2)-25)/(-1*2)
x = (5*73^(1/2)-25)/(-2) or x = (-5*73^(1/2)-25)/(-2)
10*(x-((5*73^(1/2)-25)/(-2)))*(x-((-5*73^(1/2)-25)/(-2))) = 0
(10*(x-((5*73^(1/2)-25)/(-2)))*(x-((-5*73^(1/2)-25)/(-2))))/(x*(x+15)) = 0
(10*(x-((5*73^(1/2)-25)/(-2)))*(x-((-5*73^(1/2)-25)/(-2))))/(x*(x+15)) = 0 // * x*(x+15)
10*(x-((5*73^(1/2)-25)/(-2)))*(x-((-5*73^(1/2)-25)/(-2))) = 0
( x-((-5*73^(1/2)-25)/(-2)) )
x-((-5*73^(1/2)-25)/(-2)) = 0 // + (-5*73^(1/2)-25)/(-2)
x = (-5*73^(1/2)-25)/(-2)
( x-((5*73^(1/2)-25)/(-2)) )
x-((5*73^(1/2)-25)/(-2)) = 0 // + (5*73^(1/2)-25)/(-2)
x = (5*73^(1/2)-25)/(-2)
x in { (-5*73^(1/2)-25)/(-2), (5*73^(1/2)-25)/(-2) }
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